Citation: Bo Yang, Yan Liu, Ming Li. Separation of CO₂–N₂ using zeolite NaKA with high selectivity[J]. Chinese Chemical Letters, ;2016, 27(6): 933-937. doi: 10.1016/j.cclet.2016.01.017 shu

Separation of CO₂–N₂ using zeolite NaKA with high selectivity

Department of Chemistry, Tongji University, Shanghai 200092, China

Received Date: 13 October 2015
Revised Date: 24 December 2015

The adsorption method based on solid adsorbents is one of feasible ways to capture and store CO₂. Using the ion exchange method, different zeolites NaKA varying in K+ content were produced. The adsorption isotherms and kinetic uptakes were measured. The experimental results show that the optimal NaKA could adsorb significant quantities of CO₂ and little N₂. On the zeolite NaKA with 14.7 at.% K⁺, the adsorption capacity for pure CO₂ is over 3.10 mmol g^-1 and the CO₂-N₂ selectivity is about 149 at ambient pressure and temperature. The kinetic CO₂-N₂ selectivity could also achieved 200 within 3 min according to the uptake data. To demonstrate the separation effectiveness, breakthrough curves of pure components and binary mixtures were investigated experimentally and theoretically in a fixed bed. It is found that the breakthrough points of CO₂ and N₂ are almost at the same time under the atmospheric pressure at 348 K with the raw gas composition CO₂/N₂ (20:80, v/v). If the pressure has been increased higher than 0.1 MPa, CO₂ would break through the bed much slower than N₂. Therefore, the pressure may become the limiting factor for the separation performance of zeolites NaKA.
- NaKA zeolite,
- Selectivity,
- Adsorption,
- CO₂ capture,
- Separation
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